H. thomsoni, [204], [221]

Hyalopus, [52];

H. dujardini, [59] n.

Hyalosphenia, [52];

H. lata, [55]

Hyboclypus, [558];

H. gibberulus, [558]

Hybocodon (Corymorphidae, [273]), [265]

Hydatina senta, often found with Euglena viridis, [124]

Hydra, [253] f., [255];